Diff Checker
Paste two versions of a document, config or code snippet to see exactly what changed. Switch between line, word and character comparison.
Free Runs locally No signup
Original
Changed
Paste two versions to see the differences.
Green is added, red is removed.
How to use it
1
Paste both versions
Put the original on the left and the edited version on the right.
2
Choose a comparison mode
Compare by line for documents, by word for prose, or by character for small edits.
3
Read the changes
Added text is green, removed text is red, and unchanged text stays neutral.
Why use this tool
Three comparison modes
Line, word and character diffs for different kinds of edits.
Ignore whitespace
Line mode can ignore trailing spaces and indentation noise.
Nothing uploaded
Both texts stay in your browser.
Frequently asked questions
Does it work for code?
Yes. Line mode is designed for code and configuration files, while word and character modes help with prose.
Can I ignore whitespace?
Yes. Enable Ignore whitespace in line mode to skip trailing spaces and indentation-only changes.
What do the colors mean?
Green marks added text, red marks removed text, and the neutral color marks unchanged content.
Is there a size limit?
Only your browser memory. Very large documents may be slower because the comparison runs on the main thread.
Are my texts uploaded?
No. The comparison happens locally, and nothing is sent to a server.
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